# coding=utf-8

class Person:
    def set_name(self, name):
        self.name = name
    def get_name(self):
        return self.name
    def greet(self):
        print("Hello world, I'm", self.name)

He = Person()
He.set_name("Bob")
He.greet()

She = Person()
She.set_name("Alice")
She.greet()